List of top Chemistry Questions

Six moles of an ideal gas performs a cycle shown in figure. If the temperature are $T_A = 600\, K, T_B = 800\, K, T_C = 2200 \,K$ and $T_D = 1200\, K$, the work done per cycle is approximately

$S_N1$ reaction is fastest in

$S_N2$ mechanism is involved in the following substitution :

Same amount of electric current is passed through solutions of $AgNO_3$ and HCl. If 1.08 g of silver is obtained in the first case, the amount of hydrogen liberated at S.T.P. in the second case is

$S_{N}1$ reaction is favoured by

Roasting is generally done in case of the following

Roasting of copper pyrite ores is for the following purpose

Refractory metals are used in construction of furnaces because

Relative decrease in V.P. of an aqueous solution of NaCl is 0.167. Number of moles of NaCl presentin 180 g of $H_2O$ is

Reductive ozonolysis of benzene produces

Reductive ozonolysis of o-xylene gives

Red phosphorus and hydrogen iodide reduce carboxylate ions to

Red phosphorus is less reactive than yellow phosphorus because

Reduction of aldehyde with HI and P give

Recognise the figure and find out the correct matching.

Read the passage given below and answer the question The hydrogen-like species $Li^{2+}$ is in a spherically symmetric state $S_1$ with one radial node. Upon absorbing light the ion undergoes transition to a state $S_2$. The state $S_2$ has one radial node and its energy is equal to the ground state energy of the hydrogen atom. Energy of the state $S_1$ in units of the hydrogen atom ground state energy is

Read the given statements and select the correct option. Irrigation without proper drainage of water leads to waterlogging in the soil. Waterlogging draws salts to the soil surface, which are deposited as a thin crust on the land surface or start collecting at the roots of the plants.

Read the following statements and identify the incorrect statement.

Reaction that takes place at graphite anode in drycell is

Reaction $ {CH_3CONH_2 ->[NaOBr] }$ gives

Ratio of number of oxygen atoms in $Ca_3(PO_4)_2$ and $H_3PO_3$, if both contain same number of $P$ atoms, is

Reaction of $C_6H_5CH_2Br$ with aqueous sodium hydroxide follows___________.

Ratio of difference of spacing between the energy levels with $n=3$ and $n=4$ and the spacing between the energy levels with $n=8$ and $n=9$ for a hydrogen like atom or ion is

Random motion of colloid particle is known as

Rate law for the reaction, $A+2B$ $\rightarrow$ $C$ is found to be Rrte $=k\left[A\right]\left[B\right]$ Concentration of reactant $??'$ is doubled, keeping the concentration o f $???